Genealogy research by Mark Humphrys,
commissioned by his father
the 10th Earl of Pembroke.
Montgomery was the offspring of an affair the 10th Earl had in 1762.
The portrait was exhibited at the Royal Academy in 1792 (when everyone involved in the affair was still alive).
It is now at Wilton House.
A quarter-size painting of the Wilton House portrait.
Picture in possession of Augustus Montgomery's descendants, the Gibbon family.
This copy is thought to have been painted by Montgomery's great-granddaughter Florence Gibbon around 1900.
See full size and alternative scan.
(Left) Detail of a portrait of her father by Florence Gibbon. See full size.
(Right) Detail of the above copy of the Augustus Montgomery portrait. See full size.
Seems to be the same style.
Florence must have been allowed into Wilton House around 1900 to copy it.
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